两段级联宽带碲基掺铒光纤放大器特性研究

利用四能级结构速率方程组和光功率传输方程组,研究了在碲基掺铒光纤(EDTF)中内插一个光隔离器、形成两段级联的碲基掺铒光纤放大器(EDTFA)后对EDTFA性能的改善.结果表明,在给定泵浦方式、泵浦功率、纤芯掺杂浓度和输入信号功率条件下,两段级联EDTFA可以有效的抑制光纤中反向传输放大自发辐射(ASE)噪声,降低反转粒子数的消耗,从而提高信号增益、输出功率,并且降低了噪声系数.对不同光纤长度和光隔离器内插在光纤中不同位置的研究表明,当光纤为最佳长度和光隔离器在最佳位置处时,可使短波长信号增益增加10 dB,噪声系数减小1 dB,并进一步增加了放大带宽以及功率转换效率.

Performances research of two-stage broadband erbium-doped tellurite fiber amplifier

Based on the rate equations and light propagation equations of four energy level system, the performances of gain and noise figure of broadband erbium-doped tellurite fiber amplifier(EDTFA) with an isolator in the midway are researched. The results show that the signal gain and noise figure are obviously improved due to the effective suppression of backward propagating amplified spontaneous emission (ASE) noise and the resulting consumption reduction of reversed particles by the isolator. Meanwhile the analyzing of gain and NF regard to different fiber length and different isolator position shows that the gain improvement of about 10 dB and NF reduction of 1 dB are expected at the short wavelength when the isolator lies at the optimum position. Amplified bandwidth and PCE of EDTFA also be improved with a midway isolator.